A novel compact-design homopolar magnetic bearing system is proposed for reaction wheels in satellite applications. The bearings, with low core loss, can increase the designed speed of wheel, thereby reducing rotor inertia and wheel mass required to achieve attitude control. bearings are capable producing both radial axial suspension forces using a simple L-shaped structure. thus not only simpl...

we find an explicit expression of the tutte polynomial of an $n$-fan. we also find a formula of the tutte polynomial of an $n$-wheel in terms of the tutte polynomial of $n$-fans. finally, we give an alternative expression of the tutte polynomial of an $n$-wheel and then prove the explicit formula for the tutte polynomial of an $n$-wheel.

A comparative study of the robustness of various spacecraft body at t i tude control systems with structural flexibility is presented in this paper. The control systems examined are: (a) 3-Reaction Wheels (b) Body-fixed momentum wheel with offset thrusters (c) Skewed body-fixed momentum wheels with offset thrusters and (d) Body-fixed momentum wheel with two reaction wheels. For the size of larg...

This paper addresses the attitude control of nano-spacecraft with three reaction wheels and magnetorquers in low Earth orbits, develops algorithms to maintain when any one ...